\begin{tikzpicture}
    \tkzDefPoints{0/0/A, 3.5/0/C}
    \tkzDefTriangle[school](A,C)  \tkzGetPoint{B}
    \tkzPermute(A,B,C) % 交换 B、C 坐标
    \tkzDefLine[altitude](A,C,B)  \tkzGetPoint{D}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegments(C,D)
    \tkzMarkRightAngles(A,C,B  C,D,A)
    \tkzMarkAngles[size=0.5](A,C,D)
    \tkzMarkAngles[size=0.6](D,C,B)
    \tkzLabelAngle[pos=0.7](A,C,D){$1$}
    \tkzLabelAngle[pos=0.8](D,C,B){$2$}
    \tkzLabelPoints[above](C)
    \tkzLabelPoints[below](A,B,D)
\end{tikzpicture}

